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Intangible Assets - Additional Information (Detail) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 SEK (kr) | Dec. 31, 2023 SEK (kr) | Dec. 31, 2022 SEK (kr)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 56,077 | kr 52,944 |
Impairment charges of goodwill | (1,260) | (31,897) | kr 0
Intangible assets other than goodwill | kr 7,954 | 22,667 |
Discount rate used in current measurement of fair value less costs of disposal | 113.00% |  |
Percentage of decrease in long term Ebit | 1.00% |  |
By The End Of Two Thousand And Twenty Four [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of devices to be manufactured | 3,900,000,000 |  |
By The End Of Two Thousand And Twenty Nine [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of devices to be manufactured | 6,700,000,000 |  |
Forecast [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Percentage of decrease in long term Ebit | 1.00% |  |
iconectiv [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 1,200 | 1,100 |
Vonage Holdings Corp [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment charges of goodwill | (900) | (31,900) | (15,300)
Recoverable amount cash generating unit | kr 17,000 | kr 29,500 |
Percentage of goodwill and other intangible assets | 50.00% |  |
Research And Development Expenses [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Write down of capitalized development expenses | kr (400) |  |
Impairment charges of goodwill | (1,200) |  |
Selling And Administrative Expenses [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment charges of goodwill | (12,600) |  |
Other Operating Expenses [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment charges of goodwill | kr (900) |  |
2025-2029 and 2029 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Percentage of estimated increase in mobile video traffic | 19.00% |  |
Percentage of estimated increase in mobile data traffic | 80.00% |  |
Percentage fixed wireless access of estimated increase in mobile data traffic | 35.00% |  |
Percentage fixed wireless access of estimated increase in mobile traffic | 27.00% |  |
Subscription by 2029 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Number of connected devices are forecasted | 50,000,000,000 | 30,000,000,000 |
Mobile Subscriptions [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of global mobile subscriptions | 8,700,000,000 |  |
Mobile Subscriptions [member] | Subscription by 2029 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of global mobile subscriptions | 9,400,000,000 |  |
Smart phone [member] | Subscription by 2029 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of global mobile subscriptions | 8,100,000,000 |  |
5G subscriptions [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of global mobile subscriptions | 2,300,000,000 |  |
5G subscriptions [member] | Subscription by 2029 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Estimated number of global mobile subscriptions | 5,600,000,000 |  |
Enterprise Private Network and Wireless WAN [Member] | 2022-2028 [member] | CAGR [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Compound Annual Growth Rate | 20.00% |  |
Enterprise Private Network and Wireless WAN [Member] | 2022-2028 [member] | CPaaS [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Compound Annual Growth Rate | 10.00% |  |
Capitalised development expenditure [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Remaining amortisation period of intangible assets | 3 years |  |
Customer Relationships IPR and other Intangible Assets [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets other than goodwill | kr 8,000 | kr 22,700 |
Customer Relationships IPR and other Intangible Assets [Member] | Top of range [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Remaining amortisation period of intangible assets | 7 years |  |
Customer Relationships IPR and other Intangible Assets [Member] | Bottom of range [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Remaining amortisation period of intangible assets | 3 years |  |
Networks [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 29,600 | kr 27,800 |
Write down of capitalized development expenses | kr (40) |  |
Nominal annual growth rate | 2.00% | 2.00% |
Internet of things [member] | Subscription by 2029 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Number of connected devices are forecasted | 39,000,000,000 |  |
Cash Generating Unit [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill |  | kr 300 |
Impairment charges of goodwill | kr (14,700) |  |
Cash Generating Unit [Member] | 2022-2028 [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Nominal annual growth rate | 15.00% | 15.00% |
Enterprise Wireless Solutions [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 9,900 | kr 9,000 |
Write down of capitalized development expenses | kr (200) |  |
Nominal annual growth rate | 3.50% | 3.50% |
Vonage [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 11,600 | kr 11,100 |
Head room of CGU | 1,600 |  |
Vonage [Member] | Customer Relationships IPR and other Intangible Assets [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets other than goodwill | 3,400 | 16,100 |
Cloud Software and Services [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 3,700 | kr 3,500 |
Nominal annual growth rate | 1.50% | 1.50% |
Enterprise [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | kr 22,700 | kr 21,600 |
Write down of capitalized development expenses |  |  | kr (61)

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